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lrathburn
The distinction between protostomes and deuterostomes is based on differences in their embryological development. Protostomes develop their oral end from their first developmental opening, while deuterostomes have their oral end develop from the second opening on the dorsal surface. 

Answer:

to make it more simple, the protostome develops the mouth first and then the anus and the deuterostome develops the anus first and then the mouth

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